VOIP Infrastructure Support Engineer at CloudTalk Networks Limited

CloudTalk Networks is a startup provider of cloud-based telecommunication solutions, specializing in VoIP, Unified Communications as a Service (UCaaS), and enterprise connectivity. We empower businesses with cutting-edge technology that enhances collaboration, efficiency, and scalability. Our solutions cater to a wide range of industries, from startups to large enterprises, delivering reliable, secure, and cost-effective communication tools.

We are recruiting to fill the position below:

Job Title: VOIP Infrastructure Support Engineer

Location: Lagos
Employment Type: Full-time

About the role

• The VOIP Engineer will be responsible for maintaining, optimizing, and scaling our core voice infrastructure and networks.
• This includes supporting VoIP systems (FreeSWITCH, Opensips, Kamailio), SIP trunk management, and backend configurations critical to call reliability.
• The ideal candidate will not only be a hands-on engineer but also a strong collaborator—working with other teams to solve routing issues, enhance performance, and ensure our infrastructure supports business goals.
• If you thrive on solving complex infrastructure problems and care deeply about uptime, clarity, and performance, this role is for you.

What you'll do
Infrastructure Reliability & VoIP System Support:

• Maintain, monitor, and optimize FreeSWITCH, Opensips, Kamailio, and other core VoIP infrastructure.
• Troubleshoot and resolve SIP trunk issues to ensure high call quality.
• Build and maintain scalable and secure SIP server configurations (IVRs, routing rules, extensions, call queues).

Collaboration & Support:

• Interface with customers and internal teams to resolve network and VoIP-related issues.
• Support product and engineering teams with voice infrastructure requirements and implementation.
• Collaborate with operations and growth teams on CRM and call center software integrations.

Network Performance & Security:

• Ensure network configurations (firewalls, NAT, QoS) support optimal VoIP performance.
• Diagnose call quality issues using tools like Wireshark, RTCP, and other SIP debugging utilities.
• Ensure secure handling of calls through SIP authentication, encryption, and compliance.

System Administration:

• Manage user provisioning, extensions, and DID assignments.
• Configure call queues, voicemail, call forwarding, and other PBX features.
• Ensure system redundancy, uptime, and proper disaster recovery configuration.

Documentation & Reporting:

• Maintain up-to-date documentation for infrastructure configurations and processes.
• Implement best practices for upgrades, patch management, and performance tuning.
• Contribute to cost-effective international routing and billing systems.

Key Success Metrics
Your Performance Will Be Measured By:

• Issue Resolution Time – Reduce VoIP and network issue resolution time across the business.
• Uptime & Availability – Maintain >99.9% availability for all voice infrastructure.
• Process & Documentation – Ensure critical infrastructure documentation is always current and accessible.

Qualifications & Requirements

• 4+ years experience in VoIP technologies (FreeSWITCH, Opensips, Kamailio, Asterisk, etc.).
• Proven experience with SIP trunking, call routing, PBX systems, and SIP protocol handling.
• Strong networking knowledge: TCP/IP, NAT, VPN, QoS, and firewall configuration.
• Experience with tools like Wireshark, RTCP, and CLI-based monitoring/debugging.
• Solid scripting experience and familiarity with automation tools is a plus.
• Hands-on experience integrating VoIP with CRMs or call center tools (e.g., Salesforce, HubSpot).
• Strong documentation, troubleshooting, and incident management skills.
• Ability to communicate technical concepts clearly across teams.

Application Closing Date
1st December, 2025.